MyVidster Tag results for stretched

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mitch anthamatten explains a shape-memory cycle involving strain induced crystallization
Bookmarked 508 weeks ago
see more examples of this material in action: https:wwwyoutubecomwatchv=50zu5hsdllcpolymers that visibly change shape when exposed to temperature changes are nothing new but a research team led by chemical engineering professor mitch anthamatten at the university of rochester created a material that undergoes a shape change that can be triggered by body heat alone opening the door for new medical and other applications the material developed by anthamatten and graduate student yuan meng is a type of shape-memory polymer which can be programmed to retain a temporary shape until it is triggeredtypically by heatto return to its original shapetuning the trigger temperature is only one part of the story said anthamatten we also engineered these materials to store large amount of elastic energy enabling them to perform more mechanical work during their shape recoverythe findings are being published this week in the journal of polymer science part b: polymer physics the key to developing the new polymer was figuring out how to control crystallization that occurs when the material is cooled or stretched as the material is deformed polymer chains are locally stretched and small segments of the polymer align in the same direction in small areasor domainscalled crystallites which fix the material into a temporarily deformed shape as the number of crystallites grows the polymer shape becomes more and more stable making it increasingly difficult for the material to revert back to its initialor permanentshapethe ability to tune the trigger temperature was achieved by including molecular linkers to connect the individual polymer strands anthamattens group discovered that linkers inhibitbut dont stopcrystallization when the material is stretched by altering the number and types of linkers used as well as how theyre distributed throughout the polymer network the rochester researchers were able to adjust the materials stability and precisely set the melting point at which the shape change is triggeredheating the new polymer to temperatures near 35 c just below the body temperature causes the crystallites to break apart and the material to revert to its permanent shape our shape-memory polymer is like a rubber band that can lock itself into a new shape when stretched said anthamatten but a simple touch causes it to recoil back to its original shape having a polymer with a precisely tunable trigger temperature was only one objective of equal importance anthamatten and his team wanted the material to be able to deliver a great deal of mechanical work as the shape transforms back to its permanent shape consequently they set out to optimize their polymer networks to store as much elastic energy as possiblenearly all applications of shape memory polymers will require that the material pushes or pulls on its surroundings said anthamatten however researchers seldom measure the amount of mechanical work that shape-memory polymers are actually performinganthamattens shape-memory polymer is capable of lifting an object one-thousand times its weight for example a polymer the size of a shoelacewhich weighs about a gramcould lift a liter of soda anthamatten says the shape-memory polymer could have a variety of applications including sutures artificial skin body-heat assisted medical dispensers and self-fitting apparel

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